CN101580939B - Method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles - Google Patents
Method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles Download PDFInfo
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- CN101580939B CN101580939B CN2009100671433A CN200910067143A CN101580939B CN 101580939 B CN101580939 B CN 101580939B CN 2009100671433 A CN2009100671433 A CN 2009100671433A CN 200910067143 A CN200910067143 A CN 200910067143A CN 101580939 B CN101580939 B CN 101580939B
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- nicrbsi
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- composite coating
- plasma spraying
- tungsten carbide
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Abstract
The invention relates to surface engineering technique in technical fields such as materials, electrical power, metallurgy, machine and the like, in particular to a method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles. The metallic matrix composite coating reinforced with tungsten carbide ceramics particles (WCP/NiCrBSi) is prepared on the surface of mild steel base material based on the characteristics of high hardness, wear resistance, erosion resistance of the tungsten carbide ceramics material and fine self-fluxing nature, wettability and plasma spraying technology of the NiCrBSi alloy, and the property of wear and tarnish resistance is improved. The technique process of preparing WCP/NiCrBSi composite material coating is as follows: coating design; sifting dusty spray; mixing the powder according to certain ratio; superficial treatment of base material; controlling plasma spraying parameter; preparing WCP/NiCrBSi coating.
Description
Technical field
The invention belongs to surface engineering technology, relate to technical fields such as material, electric power, metallurgy, machinery.
Background technology
Power industry is a mainstay of the national economy industry.Coal-fired flyash and the slag that produces of heat power plant boiler accounts for about 1/5 of consumption of coal, the important production link that is treated as thermal power generation of flyash and slag.The method of ash disposal mainly is divided into two kinds: a kind of is to adopt ash trench system cleaning and ash-slag delivery (being called for short the water ash disposal); Another kind is to adopt pneumatic ash removal system cleaning and ash-slag delivery (be called for short and do ash disposal).Have advantages such as conserve water resource, environmentally safe, lime-ash be recycling owing to do ash disposal system, dried ash disposal system is all adopted in the developed countries fuel-burning power plant at present, and the fuel-burning power plant of China 40% or more is also from the dried ash disposal system of external introduction.But do the serious wear problem of ash disposal system component is to do to remove the major obstacle of gray technology in China's widespread use always, also is one of subject matter that influences fuel-burning power plant operational efficiency, operating safety and cost of electricity-generating.
The wear form that ash disposal system is done by thermal power plant is mainly erosive wear.In order to improve the wear resisting property of ash disposal system, China mainly adopts traditional arc surfacing high-abrasive material or durionise method, and up to now, these two kinds of methods all can not obviously improve the erosion-wear-resisting performance and the work-ing life of doing ash disposal system.Developed countries mainly adopts surface engineering technology, prepares wear-resistant coating at dried ash disposal system component surface easy to wear, improves its wear resistance and work-ing life.According to the wear form of doing ash disposal system, the ceramic particle reinforced metal base composites coating is to improve the favourable selection countermeasure of doing ash disposal system erosion-wear-resisting performance.The tungsten carbide ceramics material has high hardness, wear resistance, solidity to corrosion; The NiCrBSi alloy has self-fluxing nature and good wettability; Plasma spraying technology has that the coating kind is many, spraying coating process is stable, coating quality is high, to advantages such as element size are unrestricted.Therefore, adopt plasma spraying technology, prepare tungsten carbide ceramics particles at dried ash disposal system component surface easy to wear and strengthen metal-base composites (WC
P/ NiCrBSi) coating significantly improves its wear resistance and work-ing life, has important engineering application value and wide application prospect.
Summary of the invention
The purpose of this invention is to provide a kind of method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles, this method is based on high rigidity, wear resistance, the solidity to corrosion of tungsten carbide ceramics material, the characteristics of self-fluxing nature that the NiCrBSi alloy is good and wettability and plasma spraying technology prepare tungsten carbide ceramics particles at the soft steel substrate surface and strengthen metal-base composites (WC
P/ NiCrBSi) coating improves the erosion resistance wear resisting property.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
A kind of method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles, by descending processing step to carry out:
A) dusty spray screening: to the WC ceramic powder of purity＞99.9% and by 15-20%Cr, 3.0-4.5%B, 4.0-6.0%Si, 0.5-1.1%C,＜5.0%Fe and surplus are that the NiCrBSi powdered alloy that Ni forms screens respectively, the acquisition granularity is that ceramic powder and the granularity of 50 μ m-100 μ m is the NiCrBSi powdered alloy of 60 μ m-130 μ m, controls the particle diameter of WC ceramic particle enhancing body in the composite coating with this;
B) ceramic powder after will screening and powdered alloy form 33-37%WC+67-63%NiCrBSi mixings dusty spray by the certain mass percent uniform mixing, with the volume fraction and the WC of WC ceramic particle enhancing body in the control composite coating
PThe bonding properties of/NiCrBSi, coating/substrate interface;
C) powder mixes by a certain percentage: before the spraying, clean the soft steel substrate surface with acetone and remove greasy dirt; Then adopt jet absorption type sandblast machine and 16# corundum sand to the sandblasting of soft steel substrate surface, increase surfaceness;
D) control plasma spraying parameter: control plasma spraying parameter makes the only surface local fusing of WC ceramic powder particle, and NiCrBSi alloy powder particle integral body melts fully, realizes WC
PThe preparation of/NiCrBSi composite coating; The plasma spraying parameter is: electric current 400A-430A; Voltage 48V-50V; Main gas Ar 45L/min-47L/min; Inferior gas H
21L/min-2L/min; Powder feed rate 30g/min-34g/min; Spray distance 80mm-100mm; Spraying rate 130mm/s-170mm/s;
E) adopt plasma spraying technology and WC+NiCrBSi mixing dusty spray, prepare WC at the substrate surface of sandblasting
P/ NiCrBSi composite coating, in Plasma Spraying Process Using, plasma gun is stable to guarantee spraying coating process and coating quality with robot arm control.
Ceramic powder after described will the screening and powdered alloy are specially: 33-37%WC+67-63%NiCrBSi by the certain mass percent uniform mixing.
Test-results shows, WC
PThe WC ceramic particle strengthens particle diameter, volume fraction and the WC of body in/the NiCrBSi composite coating
PThe bonding properties of/NiCrBSi, coating/substrate interface has tangible influence to the erosion resistance wear resisting property of composite coating.By optimizing the granularity of WC, NiCrBSi dusty spray, the mass percent of WC powder in the WC+NiCrBSi mixed powder and the WC of plasma spray coating process parameter acquisition
P/ NiCrBSi composite coating (thickness is 200-400 μ m) can significantly improve the erosion-wear-resisting performance.
The WC of method preparation of the present invention
PThe composition of/NiCrBSi composite coating and the performance index that reach: (1) WC
PWC ceramic particle enhancing body particle diameter is that 30 μ m-80 μ m, volume fraction are 28%-34% in the/NiCrBSi composite coating; (2) interface bond strength between composite coating and soft steel base material is 26MPa-37MPa; (3) WC
PThe erosive wear rate of/NiCrBSi composite coating is 5.3 * 10
-3Mm
3/ g-5.9 * 10
-3Mm
3/ g compares (33.9 * 10 with the soft steel base material
-3Mm
3/ g), WC
PThe erosion resistance mill performance of/NiCrBSi coating improves more than 6 times.
The present invention has following major advantage: (1) WC
PThe WC ceramic particle of/NiCrBSi composite coating strengthens body and has high hardness, wear resistance, solidity to corrosion, can significantly improve the erosion-wear-resisting performance; (2) NiCrBSi alloy substrate material has good self-fluxing nature and wettability, and price is lower than cobalt base alloy, helps improving the use properties of enhancing body/matrix, coating/substrate interface bonding properties and coating, also can reduce the coating preparation cost; (3) tungsten carbide ceramics material melting point height (2776 ℃), thermal conductivity are low, and NiCrBSi alloy melting point relatively low (～1180 ℃), thermal conductivity are higher, by optimizing the plasma spraying parameter, help realizing WC
PThe preparation of/NiCrBSi composite coating.
Description of drawings
Fig. 1 is WC
P/ NiCrBSi composite coating tissue.
Fig. 2 is WC
P/ NiCrBSi interface.
Embodiment
The present invention prepares WC
PThe technical process of/NiCrBSi composite coating is: coated designs → dusty spray screening → powder mixes → substrate surface treatment → control plasma spraying parameter → preparation WC by a certain percentage
P/ NiCrBSi coating.
To WC ceramic powder (purity＞99.9%) and NiCrBSi powdered alloy (15-20%Cr, 3.0-4.5%B, 4.0-6.0%Si, 0.5-1.1%C,＜5.0%Fe, the Ni=surplus) screen respectively, the acquisition granularity is that ceramic powder and the granularity of 50 μ m-100 μ m is the NiCrBSi powdered alloy of 60 μ m-130 μ m, controls the particle diameter of WC ceramic particle enhancing body in the composite coating with this.Ceramic powder after the screening and powdered alloy are pressed the certain mass percent uniform mixing, form 33-37%WC+67-63%NiCrBSi mixing dusty spray, strengthen the volume fraction and the WC of body with WC ceramic particle in the control composite coating
PThe bonding properties of/NiCrBSi, coating/substrate interface.Before the spraying, clean the soft steel substrate surface with acetone and remove greasy dirt; Then adopt jet absorption type sandblast machine and 16# corundum sand to the sandblasting of soft steel substrate surface, increase surfaceness.Adopt plasma spraying technology and WC+NiCrBSi mixing dusty spray, prepare WC at the substrate surface of sandblasting
P/ NiCrBSi composite coating, in Plasma Spraying Process Using, plasma gun is stable to guarantee spraying coating process and coating quality with robot arm control; Control plasma spraying parameter makes the only surface local fusing of WC ceramic powder particle, and NiCrBSi alloy powder particle integral body melts fully, realizes WC
PThe preparation of/NiCrBSi composite coating; The plasma spraying parameter is: electric current 400A-430A; Voltage 48V-50V; Main gas (Ar) 45L/min-47L/min; Inferior gas (H
2) 1L/min-2L/min; Powder feed rate 30g/min-34g/min; Spray distance 80mm-100mm; Spraying rate 130mm/s-170mm/s.
Prepare WC to do ash disposal valve sealing face plasma spraying below at soft steel
P/ NiCrBSi composite coating is an example, describes the specific embodiment of the present invention in detail.
Embodiment 1, employing 35%WC+65%NiCrBSi mixing dusty spray, the plasma spraying parameter is: electric current 410A; Voltage 49V; Main gas (Ar) 46L/min; Inferior gas (H
2) 1.5L/min; Powder feed rate 32g/min; Spray distance 90mm; Spraying rate 150mm/s, preparation WC
P/ NiCrBSi composite coating.WC
PThe wear-resisting rate of the erosion of/NiCrBSi coating is 5.3 * 10
-3Mm
3/ g-5.6 * 10
-3Mm
3/ g; Coating/substrate interface bonding strength is 30MPa-36MPa.
Embodiment 2, employing 33%WC+67%NiCrBSi mixing dusty spray, the plasma spraying parameter is: electric current 410A; Voltage 49V; Main gas (Ar) 46L/min; Inferior gas (H
2) 1.5L/min; Powder feed rate 32g/min; Spray distance 90mm; Spraying rate 150mm/s, preparation WC
P/ NiCrBSi composite coating.WC
PThe wear-resisting rate of the erosion of/NiCrBSi coating is 5.5 * 10
-3Mm
3/ g-5.8 * 10
-3Mm
3/ g; Coating/substrate interface bonding strength is 30MPa-37MPa.
Embodiment 3, employing 37%WC+63%NiCrBSi mixing dusty spray, the plasma spraying parameter is: electric current 410A; Voltage 49V; Main gas (Ar) 46L/min; Inferior gas (H
2) 1.5L/min; Powder feed rate 32g/min; Spray distance 90mm; Spraying rate 150mm/s, preparation WC
P/ NiCrBSi composite coating.WC
PThe wear-resisting rate of the erosion of/NiCrBSi coating is 5.4 * 10
-3Mm
3/ g-5.8 * 10
-3Mm
3/ g; Coating/substrate interface bonding strength is 26MPa-31MPa.
Embodiment 4, employing 35%WC+65%NiCrBSi mixing dusty spray, the plasma spraying parameter is: electric current 400A; Voltage 48V; Main gas (Ar) 45L/min; Inferior gas (H
2) 1L/min; Powder feed rate 30g/min; Spray distance 80mm; Spraying rate 130mm/s, preparation WC
P/ NiCrBSi composite coating.WC
PThe wear-resisting rate of the erosion of/NiCrBSi coating is 5.3 * 10
-3Mm
3/ g-5.9 * 10
-3Mm
3/ g; Coating/substrate interface bonding strength is 27MPa-33MPa.
Embodiment 5, employing 35%WC+65%NiCrBSi mixing dusty spray, the plasma spraying parameter is: electric current 430A; Voltage 50V; Main gas (Ar) 47L/min; Inferior gas (H
2) 2L/min; Powder feed rate 34g/min; Spray distance 100mm; Spraying rate 150mm/s, preparation WC
P/ NiCrBSi composite coating.WC
PThe wear-resisting rate of the erosion of/NiCrBSi coating is 5.5 * 10
-3Mm
3/ g-5.9 * 10
-3Mm
3/ g; Coating/substrate interface bonding strength is 30MPa-37MPa.
Embodiment 6, employing 33%Al
2O
3+ 67%NiCrBSi mixing dusty spray, the plasma spraying parameter is: electric current 400A; Voltage 48V; Main gas (Ar) 45L/min; Inferior gas (H
2) 1L/min; Powder feed rate 30g/min; Spray distance 80mm; Spraying rate 130mm/s, preparation WC
P/ NiCrBSi composite coating.WC
PThe wear-resisting rate of the erosion of/NiCrBSi coating is 5.3 * 10
-3Mm
3/ g-5.9 * 10
-3Mm
3/ g; Coating/substrate interface bonding strength is 26MPa-35MPa.
Claims (1)
1. method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles is characterized in that being undertaken by following processing step:
A) dusty spray screening: to the WC ceramic powder of purity＞99.9% and by 15-20%Cr, 3.0-4.5%B, 4.0-6.0%Si, 0.5-1.1%C,＜5.0%Fe and surplus are that the NiCrBSi powdered alloy that Ni forms screens respectively, the acquisition granularity is that ceramic powder and the granularity of 50 μ m-100 μ m is the NiCrBSi powdered alloy of 60 μ m-130 μ m, controls the particle diameter of WC ceramic particle enhancing body in the composite coating with this;
B) ceramic powder after will screening and powdered alloy are by the certain mass percent uniform mixing, form 33-37%WC+67-63%NiCrBSi mixing dusty spray, the volume fraction, the WC that strengthen body with WC ceramic particle in the control composite coating strengthen body and the bonding properties of NiCrBSi alloy interface and the bonding properties of coating and substrate interface;
C) powder mixes by a certain percentage: before the spraying, clean the soft steel substrate surface with acetone and remove greasy dirt; Then adopt jet absorption type sandblast machine and 16# corundum sand to the sandblasting of soft steel substrate surface, increase surfaceness;
D) control plasma spraying parameter: control plasma spraying parameter makes the only surface local fusing of WC ceramic powder particle, and NiCrBSi alloy powder art particle integral body melts fully, realizes WC
PThe preparation of/NiCrBSi composite coating; The plasma spraying parameter is: electric current 400A-430A; Voltage 48V-50V; Main gas Ar 45L/min-47L/min; Inferior gas H
21L/min-2L/min; Powder feed rate 30g/min-34g/min; Spray distance 80mm-100mm; Spraying rate 130mm/s-170mm/s;
E) adopt plasma spraying technology and WC+NiCrBSi mixing dusty spray, prepare WC at the substrate surface of sandblasting
P/ NiCrBSi composite coating, in Plasma Spraying Process Using, plasma gun is stable to guarantee spraying coating process and coating quality with robot arm control.
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| CN2009100671433A CN101580939B (en) | 2009-06-19 | 2009-06-19 | Method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120263B (en) * | 2010-01-08 | 2012-07-25 | 三河市科大博德粉末有限公司 | Method for preparing wear-resistance coating |
| CN103741140B (en) * | 2014-01-29 | 2016-04-20 | 中信戴卡股份有限公司 | Centre hole stop-pass rule renovation technique |
| CN104388875A (en) * | 2014-10-30 | 2015-03-04 | 安徽鼎恒再制造产业技术研究院有限公司 | Additive manufacturing process of roller |
| CN104357780A (en) * | 2014-10-30 | 2015-02-18 | 安徽鼎恒再制造产业技术研究院有限公司 | High-hardness Ni45-WC nanometer coating and preparation method thereof |
| CN104651827A (en) * | 2015-02-02 | 2015-05-27 | 马鞍山蓝科再制造技术有限公司 | Manufacturing method of nanometer tungsten carbide coating on mould surface |
| CN104846311A (en) * | 2015-05-09 | 2015-08-19 | 芜湖鼎瀚再制造技术有限公司 | High-hardness Ni-Cr-B-Si nano coating material and preparation method thereof |
| CN106399894A (en) * | 2016-11-18 | 2017-02-15 | 无锡明盛纺织机械有限公司 | Preparation method of WC-NiCrBSi gradient composite wear-resisting coating |
| CN108642434B (en) * | 2018-07-06 | 2021-05-04 | 扬州大学 | Preparation method of NiCrBSi-Zr wear-resistant and corrosion-resistant coating |
| CN115011961A (en) * | 2022-06-14 | 2022-09-06 | 绍兴文理学院 | Manufacturing process of self-lubricating wear-resistant coating of hob |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6884497B2 (en) * | 2002-03-20 | 2005-04-26 | Seco Tools Ab | PVD-coated cutting tool insert |
| CN101008324A (en) * | 2006-12-22 | 2007-08-01 | 陕西鼓风机（集团）有限公司 | Surface composite coating of turbomachine rotor blade and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6884497B2 (en) * | 2002-03-20 | 2005-04-26 | Seco Tools Ab | PVD-coated cutting tool insert |
| CN101008324A (en) * | 2006-12-22 | 2007-08-01 | 陕西鼓风机（集团）有限公司 | Surface composite coating of turbomachine rotor blade and preparation method thereof |
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